Cranks Normally But Hard To Start - When Engine Cold - Mazda 121 Workshop Manual

TROUBLESHOOTING GUIDE
F
CRANKS NORMALLY AUT HARO TO START - WHE E GINE COLD
DESCRIP.
TION
.Englne crank al nofmal speed but rcquires excossive cranking lime before slarl ng
. Baltery n nofmal condition
. Festarc OK after wam-uo
.Engrne runs no.mally at idle [f idle cond]tion is not OK, r€ter io 'Rough ldle' (Nos. 8-12)l
rrnouBLEsHoollt{G
HtNTsl
O Air/Fuel m)dure too rich
.Fuel injeclion convol mal,unction
(Correction tor coolant lemperature)
.Thermowax mallunclion
@A1r/Fuel m xiure roo ean
.Carbon deposlt ln hol wire passage
. Fu€l inj€ction conlrol malfunction
(Coffeclion ior coolant lemperalure)
@ Poor atom zation
. Low RVP (summer) fuel b€rng used
INSPECTION
ACTION
ls "o0 displayed on Sell Diagnosis Ch€cker
wlth ignition switch ON?
17 page F-67
SYSTEM SELECT: r
Malfunctlon Code No, displayed
Check lor cause Feler 10 soeciti€d
check sequencei
E? page F-7O
"88" llashes
Check ECU terminal 1F voltage
c7 page F-'l 14
Voltage: Approx. 12V
(lgnition switch ON)
d
ll OK, replace ECU rr page F-112
4
ll not OK, check wiing betlveen
ECU and SelfDiagnosis Checbr
2
Are ECU leminal vollages OK?
(Especiaiy 1C. 2D, and 20)
-:r page F-112
Check for caus€
c7 page F-115
F - 1 1 7
F - l t 9
3
Does engine slart easily when throtlle valve Check lhemowar
c7 page F-85
4
f OK, go to Srep 5
4
ll nol OK, replace injeclion body
ls there air leakage ol inlake ar system com'
5 ls arr cleaner element clean?
cr page F-62
Beplace air cleaner element
6
Are spark plugs OK?
e page G-19
WEAB AND CAqBON AUILOUP
(0.039-0.043 in)
BUFNS
E AND
DETEFIORATION
F-25